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Well, if you have a mated pair, they will be spawning about every 18-20 days. Nothing new for them to eat their eggs after first spawns. I had my pair for a couple years and they ate "every" spawn. I could have moved the eggs but like you, did not want the babies. Babies require too darned many tanks.

The female matures earlier than the male. This helps to defer brother sister crosses in the wild. She won't mate with her brother if he is too young, this fosters diversity. In a captive setting it can take 3 to 6 spawns before the male becomes properly fertile. Many times he is just a poor aim. Sometimes he just does not have enough milt. You can look at the eggs with a magnifying glass and see the embryo develop within the egg casing. Sometimes there is just an over whelming amount of bacterium that might eat the precious egg fats. In this case the egg will be lost.

i would not worry to much just let them spawn a few times and they will get the hang of it, getting a F/F pair is highly unlikely but can happen, i have 6 pairs of breeding angelfish but only one pair really gets any fry to survive most of the pairs only get 10-15 fertile eggs. the pair i have that has spawned the most are the best just a week ago they laid egg in the large tank were i keep all my angels (19 in total) with some catfishes and this pair acctualy got them to free swimming without a problem took them out since i would like to keep the fry. like most say here angels take long to really understand how to do it. A friend of mine has a pair he have had for over 6 years and have spawned countless times still eats the fry when they become wrigglers

Gas mileage isn't everythingOIIIIIIIOLack of planning on your part does not constitute an emergency on my part.Why pretend there are no stupid questions? Actually, There are many stupid questions: "Should I drink this bleach?" Is just one example.
Having said that, Just because it's a stupid question doesn't mean that it shouldn't be asked. It's better to know.A warm beer is better than a cold beer. Because nothing is better than a cold beer, and a warm beer is better than nothing.